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Investments (Estimated Fair Value Of Investments) (Details) (USD $) In Thousands, unless otherwise specified | 12 Months Ended
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Dec. 31, 2014
Fixed maturity securities: |
Due in one year or less | $ 42,637 mcy_TradingSecuritiesDebtMaturitiesWithinOneYearFairValue
Due after one year through five years | 355,106 mcy_TradingSecuritiesDebtMaturitiesAfterOneThroughFiveYearsFairValue
Due after five years through ten years | 593,934 mcy_TradingSecuritiesDebtMaturitiesAfterFiveThroughTenYearsFairValue
Due after ten years | 1,626,723 mcy_TradingSecuritiesDebtMaturitiesAfterTenYearsFairValue
Total | $ 2,618,400 us-gaap_InvestmentsFairValueDisclosure
Percentage of fixed maturities | 1.40%mcy_PercentageOfFixedMaturitySecurities

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- Definition Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Available-for-Sale Securities -URI http://asc.fasb.org/extlink&oid=6505594 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Trading Securities -URI http://asc.fasb.org/extlink&oid=6526789 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 25 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=28360136&loc=d3e22054-111558 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 1 -Subparagraph a, f, g -Article 7 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 35 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=27723805&loc=d3e24584-111560 + Details
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